Hi there,
I have an annoying intermittent fault I am having a hard time tracking down, as is the shop. The bike will sometimes be very hard to start - as in can run a battery flat. Sometimes it fires straight up, similar temperature days, no real difference.
The biggest symptom of the issue is throttling problems, if I give it some oomph while riding in the first 15 or so minutes, the bike can stop responding. The RPM's cut out and the bike will buck. This is an intermittent problem so hard to track. But it can be dangerous as I'm expecting the use of the throttle. The bike acts as if its getting no fuel, or no spark. However it seems to be getting both.
It doesn't seem to happen so much if the engine is hot (after 15 minutes of riding).
However within that first 15 minutes, I can lose use of the throttle, the engine can cut out completely, but most likely it will just stop accelerating and cut out when I put it under load and give it gas. The engine does appear to need to be put under load for the problems to occur.
When it got really bad the bike would not run at all, it would stall out any time I gave it any throttle. Pushed it to the shop, they changed the plug, (it looked lean) it got better.
I have checked the 02 sensor - (could this be the cause?) it wasn't too dirty. I have cleaned with alcohol.
The side stand switch apparently can cause mixture problems. This has been disconnected.
All wiring / ground seems to be good. No fault lights.
Its really annoying as I don't trust the bike right now which is no fun, can anyone point me in any direction to check?